Binding of Quarks and the Πn Σ-term
نویسندگان
چکیده
It is shown that the binding effect that is associated with the short range part of the Goldstone boson exchange interaction between constituent quarks provides a good description of the πN σ-term.
منابع مشابه
ar X iv : h ep - p h / 96 08 28 3 v 1 9 A ug 1 99 6 Binding of Quarks and the πN σ - Term
It is shown that the binding effect that is associated with the short range part of the Goldstone boson exchange interaction between constituent quarks provides a good description of the πN σ-term.
متن کاملThe πN Sigma term – a lattice investigation
A lattice calculation of the πN sigma term is described using dynamical staggered fermions. Preliminary results give a sea term comparable in magnitude to the valence term. Introduction and Theoretical Discussion Hadrons appear to be far more complicated than the (rather successful) constituent quark model would suggest. For example a recent result from the EMC experiment, [1], suggests that co...
متن کاملPion - nucleon scattering and the nucleon sigma term in an extended linear sigma model
A modified linear sigma model that allows for g A = 1.26 by addition of vector and pseudovector πN coupling terms was discussed by Bjorken and Nauenberg and by Lee. In this extended linear sigma model the elastic πN scattering amplitudes satisfy the relevant chiral low-energy theorems, such as the Weinberg-Tomozawa relation for the isovector πN scattering length and in some cases Adler's " cons...
متن کاملThe Nucleon Sigma Term from Threshold Parameters
A new sum rule determines the nucleon sigma term by the πN elastic scattering threshold parameters alone. This “threshold” value of σ(2μ2) provides an independent check of existing values obtained from global dispersive analyses, and also provides a realistic error assignment. Employing a recent analysis of low energy (Tπ < 100 MeV) πN data our sum rule implies σ(2μ2) = 71± 9 MeV.
متن کاملNucleon Resonances in Meson Nucleon Scattering with Strangeness Production
An effective Lagrangian model in a coupled channels framework is applied to extract nucleon resonance parameters. In the K-matrix approximation, we simultaneously analyze all the available data for the transitions from πN to five possible meson-baryon final states, πN, ππN, ηN,KΛ, and KΣ, in the energy range from πN threshold up to √ s = 2 GeV. In this work, we focus our efforts on the KΣ chann...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996